Hello! On Fri, May 3, 2013 at 3:28 PM, Marat Dakota wrote: > Ok, I need improper way then. Just some way. > > The problem is that I know "bbb" only after the subrequest is made. And > subrequest's body is being completely filtered by body filter. So, in fact I > will not have "ccc", just "aaabbb", but I can't flush "bbb" out because it > waits for the subrequest to be done. >
Well, I ran into this problem while working on the "light thread" model [1] for my ngx_lua module months ago. The default Nginx subrequest setup ensures the output order by means of ngx_http_postpone_filter_module and r->postponed. So we need workarounds here. The solution I end up with is to write my own version of the ngx_http_subrequest function in ngx_lua and temporarily switch the current active request (i.e., r->connection->data) to the parent request every time the parent request is trying to output something when there's still pending subrequests running (so as to bypass ngx_http_postpone_filter_module). This works pretty well. You can check out the ngx_lua module's source for more details https://github.com/chaoslawful/lua-nginx-module especially the file src/ngx_http_lua_subrequest.c. Among other things, maybe you want to consider directly using ngx_lua instead of writing your own Nginx C module for this task. Best regards, -agentzh [1] http://wiki.nginx.org/HttpLuaModule#ngx.thread.spawn _______________________________________________ nginx-devel mailing list nginx-devel@nginx.org http://mailman.nginx.org/mailman/listinfo/nginx-devel